Prism框架的Regions使用

Prism框架的Regions，可以把用户控件、窗体等附加到主窗体指定的控件中。

【实战1】

1、新建Prism Blank App(WPF) 项目：Demo0810

Views文件夹处，鼠标右键——添加——新建项——Prism——Prism UserControl(WPF)，名称默认

MainWindow.xaml.cs代码：

using System.Windows;
using Prism.Regions; //引入Regions

namespace Demo0810.Views
{
    public partial class MainWindow : Window
    {
        public MainWindow(IRegionManager regionManager) //定义变量
        {
            InitializeComponent();
            //将PrismUserControl1用户控件加载到主窗体的ContenRegion控件中
            regionManager.RegisterViewWithRegion("ContentRegion", typeof(PrismUserControl1));
            ////或者
            //PrismUserControl1 viewA = new PrismUserControl1(); //new出一个类的对象
            //_regionManager.AddToRegion("ContentRegion", viewA);
        }
    }
}

PrismUserControl1.xaml代码：其他文件原封不动

<UserControl x:Class="Demo0810.PrismUserControl1"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:prism="http://prismlibrary.com/"
             prism:ViewModelLocator.AutoWireViewModel="True">
    <Grid>
        <TextBlock Text="View A" FontSize="38" />
    </Grid>
</UserControl>

或者MainWindow.xaml.cs不更改（保持极简纯粹），更改MainWindowViewModel.cs的代码：推荐

using Prism.Mvvm;
using Prism.Regions; //引入Regions

namespace Demo0810.ViewModels
{
    public class MainWindowViewModel : BindableBase
    {
        private string _title = "Prism Application";
        public string Title
        {
            get { return _title; }
            set { SetProperty(ref _title, value); }
        }
        public MainWindowViewModel(RegionManager regionManager) //定义变量
        {
            //将PrismUserControl1用户控件加载到主窗体的ContenRegion控件中
            regionManager.RegisterViewWithRegion("ContentRegion", typeof(PrismUserControl1));
            ////或者
            //PrismUserControl1 viewA = new PrismUserControl1(); //new出一个类的对象
            //_regionManager.AddToRegion("ContentRegion", viewA);
        }
    }
}

【实战2】仿照实战1新建项目Demo08101、添加用户控件PrismUserControl1.cs

主窗体界面前端代码MainWindow.xaml：

<Window x:Class="Demo08101.Views.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:prism="http://prismlibrary.com/"
        prism:ViewModelLocator.AutoWireViewModel="True"
        Title="{Binding Title}" Height="350" Width="525">
    <DockPanel LastChildFill="True">
        <Button Command="{Binding ShowCommand}" DockPanel.Dock="Top" >Add View</Button>
        <ContentControl prism:RegionManager.RegionName="ContentRegion" />
    </DockPanel>
</Window>

MainWindowViewModel.cs代码：其他文件原封不动

using System;
using Prism.Mvvm;
using Prism.Commands;
using Prism.Regions;
using Demo08101.Views;

namespace Demo08101.ViewModels
{
    public class MainWindowViewModel : BindableBase
    {
        private string _title = "Prism Application";
        public string Title //数据属性
        {
            get { return _title; }
            set { SetProperty(ref _title, value); }
        }
        public DelegateCommand ShowCommand { get; set; } //命令属性

        IRegionManager _regionManager; //定义变量
        public void Show() //方法，展示用户控件到指定的主窗体控件中
        {
            _regionManager.RegisterViewWithRegion("ContentRegion", typeof(PrismUserControl1));
            ////或者
            //PrismUserControl1 viewA = new PrismUserControl1(); //new出一个类的对象
            //_regionManager.AddToRegion("ContentRegion", viewA);
        }

        public MainWindowViewModel(IRegionManager regionManager)
        {
            _regionManager = regionManager; //赋值
            this.ShowCommand = new DelegateCommand(new Action(Show)); //命令属性关联方法
        }
    }
}